Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 20-02-2021 and time 01:36:42 (Italy) in region 1 km E Spoleto (PG)

A magnitude ML 0.8 earthquake occured in region: 1 km E Spoleto (PG), on

  • 20-02-2021 00:36:42 (UTC)
  • 20-02-2021 01:36:42 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7370, 12.7510 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 1 38218 38218
Sant'Anatolia di Narco PG 7 564 38782
Scheggino PG 7 461 39243
Campello sul Clitunno PG 10 2442 41685
Vallo di Nera PG 10 364 42049
Castel Ritaldi PG 12 3278 45327
Ferentillo TR 13 1913 47240
Poggiodomo PG 15 117 47357
Montefranco TR 16 1276 48633
Trevi PG 16 8469 57102
Cerreto di Spoleto PG 16 1075 58177
Arrone TR 17 2763 60940
Acquasparta TR 17 4778 65718
Giano dell'Umbria PG 18 3846 69564
Polino TR 19 233 69797
Monteleone di Spoleto PG 19 599 70396
Massa Martana PG 19 3770 74166
Montefalco PG 19 5679 79845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Terni (111501 inhabitants)
25 Km S of Foligno (57155 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
78 Km W of Teramo (54892 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
86 Km N of Tivoli (56533 inhabitants)
96 Km N of Roma (2864731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.8 2021-02-20
00:36:42		 42.7368 12.7512 10 2021-02-20
00:55:14		 Sala Sismica INGV-Roma 87310051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 00:36:42 ± 0.05
Latitude 42.7368 ± 0.0036
Longitude 12.7512 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87310051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 508
Semi-minor axis of confidence ellipse (meter) 197
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 217
Circular confidence region, given by single value of horizontal uncertainty (meter) 510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.11421
Epicentral distance of station farthest from the epicenter (degree) 0.29048
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 87310051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 00:55:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHZ. 2021-02-20T00:36:53.66 0.6 undecidable manual S 23 32.2455 50 0.04 66
IV.NRCA.HHZ. 2021-02-20T00:36:53.30 0.6 undecidable manual S 70 31.4463 50 -0.11 65
IV.LNSS.HHZ. 2021-02-20T00:36:52.41 0.6 undecidable manual S 122 27.8499 50 -0.05 66
IV.MOMA.HHZ. 2021-02-20T00:36:48.86 0.6 undecidable manual S 297 16.4724 121 -0.17 66
IV.NRCA.HHZ. 2021-02-20T00:36:48.75 0.6 undecidable manual P 70 31.4463 50 0.03 66
IV.CESI.HHZ. 2021-02-20T00:36:48.88 0.6 positive manual P 23 32.2455 50 0.03 66
IV.LNSS.HHZ. 2021-02-20T00:36:48.18 0.6 undecidable manual P 122 27.8499 50 0.01 67
IV.GAVE.EHZ. 2021-02-20T00:36:47.85 0.6 undecidable manual S 113 12.6762 128 -0.09 67
IV.MOMA.HHZ. 2021-02-20T00:36:46.29 0.3 positive manual P 297 16.4724 121 0.09 100
IV.GAVE.EHZ. 2021-02-20T00:36:45.73 0.6 undecidable manual P 113 12.6762 128 0.16 66
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:0.8 0.000049850000000000006 0.18 AML other m 2021-02-20T00:36:49.33
IV.MOMA.HHE. ML:0.8 0.0000618 1.34 AML other m 2021-02-20T00:36:49.86
IV.NRCA.HHN. ML:0.6 0.000019999999999999998 0.14 AML other m 2021-02-20T00:36:53.66
IV.LNSS.HHE. ML:0.8 0.00003505 1.46 AML other m 2021-02-20T00:36:53.77
IV.LNSS.HHN. ML:0.8 0.000027950000000000002 0.62 AML other m 2021-02-20T00:36:54.65
IV.NRCA.HHE. ML:0.7 0.00002575 0.58 AML other m 2021-02-20T00:36:54.59
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download